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25m
revised Picking and replacing balls from a bag until you are relatively certain you have picked each one at least once
deleted 3 characters in body; edited title
8h
comment Sum of the reciprocals topology
Your proof of non-Hausdorffness probably shows that the space is hyperconnected (irreducible).
12h
comment Peripendicular Line at distance d from point in a given direction
Please don't use answers to make comments. (E.g., the first line/original revision of this answer.) Once you have enough reputation you will be able to comment on any post.
23h
revised What is the member in the last set of this pattern?
rolled back to a previous revision
23h
comment A road-map through “Combinatorial Set theory: With gentle intro to independence proofs”
Have you looked through the Preface to Halbeisen's text?
1d
comment Show that $X \cup \mathcal{E}(X)$ ( $X$ and the ends of $X$) is a compact Hausdorff space.
I am guessing that by end, you mean something like what Wikipedia talks about. If so, it might be helpful to add a brief description of this concept to your question. It would also help if you state where this question comes from.
1d
revised Why doesn't the decision problem for Presburger arithmetic demonstrate that $\mathsf{P} \neq \mathsf{NP}$
deleted 2 characters in body
1d
revised Why doesn't the decision problem for Presburger arithmetic demonstrate that $\mathsf{P} \neq \mathsf{NP}$
added 317 characters in body; edited tags; edited title
1d
revised Basis for a eigenspace (multiple choice problem)
MathJaxified
2d
comment A metric on the set of closed bounded subsets of a metric space
I have attempted to transcribe your images into the "text" format allowed here. Please see this page for further information about this. Also, please ensure that I didn't unintentionally alter the meaning of your question.
2d
revised A metric on the set of closed bounded subsets of a metric space
Mainly, converted images into MathJax
2d
comment Prob. 2 (e), Sec. 27 in Munkres' TOPOLOGY, 2nd ed: Open supersets and $\epsilon$-neighborhoods of closed noncompact sets
Your question contained a lot of stuff that wasn't really relevant to the specific question you were asking. Please try to make your questions concise. (No need to even mention every part of a multi-part question if you are only going to ask about one part.)
2d
revised Prob. 2 (e), Sec. 27 in Munkres' TOPOLOGY, 2nd ed: Open supersets and $\epsilon$-neighborhoods of closed noncompact sets
removed a lot of superfluous stuff; descriptive title; added tag
2d
revised Calulating the Ramsey number $R(T, K_{1,n})$ of a tree $T$ and bipartite graph $K_{1,n}$
added 9 characters in body; edited title
2d
revised Does $\int_a^\infty f$ exist iff $\int_a^\infty |f|$ exists?
improved English, removed self-deprecation.
2d
revised Finding the angle between lines represented by a homogenous equation
reverted to arctan, slightly better presentation
2d
comment Name for a continuous surjection such that $\operatorname{cl}(f^{-1}(A)) = f^{-1}(A') \implies \operatorname{cl}(A) = A'$
@Rememberme There is no "d". You were probably misreading $cl$ (now rendered as $\operatorname{cl}$).
2d
revised Name for a continuous surjection such that $\operatorname{cl}(f^{-1}(A)) = f^{-1}(A') \implies \operatorname{cl}(A) = A'$
added 27 characters in body; edited title
2d
revised Finding the minimum value of a function in an ellipse
deleted 22 characters in body
2d
revised Margin of error for a tangent line approximation problem related to the volume of a sphere
deleted 169 characters in body; edited title